Spring trip for implements



SePt- 24 1963 M. D. JENNINGS ETAL 3,402,773

SPRING TRIP FOR IMPLEMENTS Filed Jan. 26, 1966 lNvENTORs MAPA/lmDJENNINGS BENJAMIN A` SHADER United States Patent O 3,402,773 SPRINGTRIP FOR IMPLEMENTS Marvin D. Jennings, Naperville, Ill., and BenjaminA.

Shader, Golden, Colo., assignors to International Harvester Company,Chicago, Ill., a corporation of Delaware Filed Ian. 26, 1966, Ser. No.523,146 Claims. (Cl. 172-265) This invention relates to earth workingimplements and particularly to cultivators and the like.

An object of the invention is the provision of simple and economicalspring trip means for cultivators and the like.

Another object of the invention is the provision of novel means formounting an earth penetrating tool on its support to accommodatetripping of the tool to an inoperative position in response to abnormaldraft forces acting thereon and automatic return of the tool to itsoperating position.

Other objects and advantages of the invention will become clear from thefollowing detailed description when read in conjunction with theaccompanying drawings, wherein:

FIGURE l is a view in side elevation of an earth working implementembodying the features of this invention and showing a cultivator in itsoperating position.

FIGURE 2 is a View similar to FIGURE 1 Showing the cultivating tool inits tripped position, land FIGURE 3 is a view from the rear of FIGURE 1.

In the drawings the numeral designates a tool supporting shankbifurcated at its lower end by the provision of a standard 11 to thelower end of which a pair of spaced plates 12 are secured by bolts 13`and nuts 14.

The lower ends of plates 12 carry a pivot pin 15 upon which is mounted,between plates 12, a channel shaped foot piece 16 having ears 17, anupper transverse connecting web 18, and spaced webs 19 and 20, the lowerportion of foot piece 16 serving for the mounting thereon of an earthpenetrating cultivator shovel 21, indicated in dotted lines in FIGURES 1and 2, the earth working tool being secured to the foot piece 16 byconvention-al means, not shown.

A block 22 is aiiixed to the central portion of pin 15 and serves aS ananchor for one end of a helically coiled leaf spring 23, the outerterminal coil portion 24 of which is bent upwardly at its end andprovided with a vertical Slot 25 in which is received a bolt 26 threaded-for reception in a threaded opening in the lower end of standard 11,and having a head 27.

A nut 28 is threaded on bolt 26 and contines therebetween and the upperend of the coil spring, lan eccentric 29 mounted on the bolt endengageable with the generally horizontal portion 24 of the leaf spring.The portion 24 of the leaf spring is tensioned upwardly into engagementwith eccentric 29, so that rotation of the eccentric results in avertical adjustment of the bent end of the spring within the confines ofslot 25, the purpose of such adjustment being hereinafter more fullyunderstood.

A pin 30 is secured between ears 17 of foot piece 16 and has mountedthereon a roller 31 engageable with a shoulder 32 formed by a bend inthe outer coil of the leaf spring 23 and forming an abutment on theinner face of the spring engageable by roller 31, the latter serving asa stop to hold the foot piece and the tool 21 in their operatingposition as shown in FIGURE 1 under normal Soil and draft conditions.Adjustment of the pitch of the foot piece 16 and its associated earthworking tool 21 is made by adjusting bolt 26, the end of which engagesthe web 18.

When abnormal draft conditions are encountered that would otherwisedamage the earth working tool 21, the stop member 30, 31 rolls over theabutment 32 to the position shown in FIGURE 2 and the earth working tooltrips toits inoperative position against the tension of the spring. Inthe tripped position of FIGURE 2 the earth working tool is biased byspring 23 to return to the operating position of FIGURE 1.

The eccentric 29 is shown in the position in which the greatest tensionis applied by the spring against the roller 31 so that the greatestpressure is required to cause the tool to trip. To lessen the requiredtripping pressure the nut 28 is moved away from eccentric 29 so that thelatter can be revolved to present a side of shorter radius against thepressure of the spring. Nut 28 is then again tightened to frictionallyhold the eccentric and the bent end of the spring against the head 27 ofthe bolt.

It is believed that the construction and operation of the novelimplement spring trip of this invention will be clearly understood fromthe foregoing description. It should likewise be understood that theinvention has been described in its preferred embodiment and thatmodifications may be made therein without departing from the Spirit ofthe invention or the scope of the appended claims.

What is claimed is:

1. In an implement a shank having a transverse pivot pin mounted in itslower end, an earth penetrating tool mounted on said pivot pin fortripping about the axis thereof from an operating to a tripped position,yieldable means opposing the tripping of said tool comprising a leafspring having one end anchored t-o said shank and a plurality of coilshelically arranged about the axis of said pivot pin, means securing theother end of said spring to the shank at a location remote from saidpivot pin, said spring having means forming an abutment thereon, and astop member mounted on said tool and engageable with said abutment tohold the tool against tripping in the normal operation thereof, Saidspring being yieldable radi-ally in response to abnormal draft forcesacting on said tool during operation to cause said stop member to rideover said abutment and accommodate tripping of the tool.

2. The invention set forth in claim 1, wherein said abutment is formedon the inner Surface of one of said coils.

3. The invention set forth in claim 2, wherein Said shank is bifurcatedat its lower end and said tool includes a pair Iof ears mounted in thelower end of the shank on said pivot pin and confining a substantialportion of said leaf spring therebetween to prevent lateral deection ofthe spring.

4. The invention set forth in claim 3, wherein said stop member is aroller rotatably mounted between said ears.

5. The invention set fort-h in claim 4, wherein Said abutment is a bendin said spring forming a shoulder engageable with said stop member.

References Cited n UNITED STATES PATENTS 290,366 12/1883 Snyder etal.172--710 1,194,006 8/1919 Fry 172--265 ABHAHAM G. STONE, PrimaryExaminer.

I. PETERSON, Assistant Examiner.

1. IN AN IMPLEMENT A SHANK HAVING A TRANSVERSE PIVOT PIN MOUNTED IN ITSLOWER END, AN EARTH PENETRATING TOOL MOUNTED ON SAID PIVOT PIN FORTRIPPING ABOUT THE AXIS THEREOF FROM AN OPERATING TO A TRIPPED POSITION,YIELDABLE MEANS OPPOSING THE TRIPPING OF SAID TOOL COMPRISING A LEAFSPRING HAVING ONE END ANCHORED TO SAID SHANK AND A PLURALITY OF COILSHELICALLY ARRANGED ABOUT THE AXIS OF SAID PIVOT PIN, MEANS SECURING THEOTHER END OF SAID SPRING TO THE SHANK AT A LOCATION REMOTE FROM SAIDPIVOT PIN, SAID SPRING HAVING MEANS FORMING AN ABUTMENT THEREON, AND ASTOP MEMBER MOUNTED ON SAID TOOL AND ENGAGEABLE WITH SAID ABUTMENT TOHOLD THE TOOL AGAINST TRIPPING IN THE NORMAL OPERATION THEREOF, SAIDSPRING BEING YIELDABLE RADIALLY IN RESPONSE TO ABNORMAL DRAFT FORCESACTING ON SAID TOOL DURING OPERATION TO CAUSE SAID STOP MEMBER TO RIDEOVER SAID ABUTMENT AND ACCOMMODATE TRIPPING OF THE TOOL.